We propose a method for calculation of a periodic slow-wave system designed as a double comb immersed into a rectangular waveguide. The approach is based on solving a system of integral equations obtained by the method of field matching in different regions. The system of integral equations is reduced to an algebraic system of linear homogeneous equations using Galerkin’s method with allowance for the singular behavior of the field on the edges of the comb pins. The results of calculating characteristics of the slow-wave system of the millimeter-wave travelingwave tube with a sheet electron beam are presented.
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